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Learn how to dynamically change an API endpoint address based on user input using JavaScript and HTML with this simple guide.
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This video is based on the question https://stackoverflow.com/q/71334324/ asked by the user 'mrt' ( https://stackoverflow.com/u/17078478/ ) and on the answer https://stackoverflow.com/a/71334515/ provided by the user 'Craig Wayne' ( https://stackoverflow.com/u/1654250/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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How to Manipulate an API Endpoint Address Based on User Input in JavaScript

Creating a simple weather application can be a fun and exciting project to delve into web development. One fundamental aspect of this project is learning how to manipulate an API endpoint address based on user input. In this guide, we will guide you through the steps to achieve this with HTML and JavaScript, even if you're a beginner with limited programming experience.

The Problem: User Input in API Calls

For your goal to display current weather conditions, you'll need to make requests to an API, which is a service that allows access to external data—in this case, weather data. What you want to do is allow the user to enter a location into an input field, and then use that input to form a valid API request URL.

Step-by-Step Solution

Let’s break down the process into manageable steps. Here's how to change the endpoint address dynamically based on user input.

Step 1: Access the Input Element

To start, we need to grab the input element where the user will enter the location.

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Step 2: Retrieve the Value

Next, we need to get the value entered by the user in the input field:

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Step 3: Build the API URL

Now that we have the location value, we can dynamically create the URL for the API request:

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Make sure to replace API with your actual API key.

Step 4: Fetching Data from the API

Now that we have our URL, we can write a function to fetch data from the API. Here’s how to put it all together in a function:

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Step 5: Listen for Form Submission

Finally, we will need to set up an event listener on the form so that when the user clicks the submit button, fetchAPIData is executed.

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Final Code Snippet

Here’s how your full JavaScript might look:

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HTML Structure

Here’s how your HTML should generally look with the form and submit button:

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Conclusion

You’ve just learned how to dynamically adapt an API endpoint address based on user input using HTML and JavaScript. By incorporating user input into your API calls, you transform your web application into a more interactive experience.

In future projects, you can expand this basic framework by implementing features like error handling, data display in the output section, or even using other APIs. Keep experimenting and happy coding!